Door lock



F.G.DARUNGTON DOOR LOCK Oct. 22, 1929.

Filed Afig. s, 1927 2 Sheets-Sheet l INVEN TOR. Eanzz'si l7ariifyfa m BY 26 546 F .AQ PHEIQ Patented Oct. 22, 1929 UNITED STATES PATENT OFFICE DOOR LOCK Application filed August 3, 1827. Serial No. 210,235.

This invention relates to a door lock, and its ob'ect is to produce a lock which will be capable of being installed in the door with the minimum amount of labor, and which will not require a key to lock but which can be opened with a key on the outside of the door easily.

An object of the invention is to produce a lock which can be installed with a minimum n of labor by merely boring two holes in the door with an auger, the bolt being installed in one hole and the knob including the lock in the other hole.

A further object of the invention is to-proi5 duce a satisfactory door lock of the usual type with a minimum number of parts.

Another object of the invention is to provide a strong lock which when once installed will not readily get out of order, and which an cannot be taken off the door from the outside.

Other objects of the invention will be apparent as the description proceeds.

An embodiment of the invention is shown in the accompanying drawings in which the same reference numeral is applied to the same portion throughout the several figures of the drawings and of which there may be modifications.

Figure 1 is a vertical sectional view of a an portion of the door and the lock,

Figure 2 is a plan view of the lock with a portionrof the door and a portion of the lock shown in section,

Figure 3 is a front elevation of the casing in which the operating mechanism is'secured, Figure 4 is an end View of the casing shown in Figure 3,

Figure 5 is a sectional View of the door and lock on line 55 of Figure 2,

Figure 6 is an end view of the mechanism whereby the lock is either opened or locked with the key, the position of the mechanism indicating the inoperative position,

Figure 7 is an end view of the same parts M with the lock in the position to be operated by the knob at will, and

Figure Sis a plan view of one of the snaps for securing two of the tubes of the lock together.

m This lock is of the type in which the bolt is operated by sliding the door knobs longitudi nally with respect to their supporting shanks and consists of two independent assemblies. The first assembly is the flanged sleeve 1 which carries the bolt 2. This bolt has a shank 3 which is surrounded by a spring 4 to hold it normally extended as sho wn'in Fi ure 2.

The sleeve 1 is cylindrical, one portion being of'greater diameter than the other, while the portion 5 is small enough to engage the shank 3. This assembly is placed in a hole bored in the center of the edge of the door and the shank 3 extends through the casing which holds the operating mechanism.

The casing which holds the operating mechanism is made of sheet metal and includes four rectangular corrugations 6, 7 ,8 and 9 formed outwardly from the four cylindrical parts 12 to 13 inclusive of said casing. This casing is secured by means of a nail 14 in a central position in a hole bored through the door transverse to the hole in which the casing 1 is placed.

The bolt operating mechanism consists of a bell crank 15 with a short leg 16 and a longer leg 17 which longer leg is placed in a position parallel to, and in the corrugation 6, there being a pivot pin therefor at 18 near one end of the casing. The casing is cut away as indicated at 19, Figure 3, to permit it to be assembled in place over the shank 3.

After the casing has been assembled and placed in the door the usual rosette finish plates 20, 21 are secured in the proper location, and the knob holding tubes are then inserted in place. The knob holding tubes comprise the two tubes 22 and 23 which tubes can be made substantially identical with each other as uniformity of product is desired, and have some suitable knob material secured thereto as indicated at 24 and 25, the sleeves being formed with a ridge at26 and then rolled outwardly as indicated at 27 to secure the knob in place.

Inside the tube 23 there is a tube 28 which 1 tube is flared outwardly at 29 to hold the tube in place, while within it is a solid core 30 which carries a cylinder lock 31 of usual construction. This cylinder lock has a centrally placed operating stud 32 and said stud carries the operating lever 33 secured thereto by a pin 34 with a fiat operating arm 35 at its outer end.

The core 30 and tube28 are secured together by means of two unch marks as indicated at 36 and 37. t the end opposite from the knob the tube 28 has two snap lugs 39-40 (see Figures 1 and 8) which are projected outwardly from the end of the sleeve and which are carried by a spring tongue 41, said tube 28 being slotted at the to permit the locking lugs to be inserted-in P a position end on both sides adjacent said lugs 3940 lace inside of the tube 22, and when so inserted they secure the tube 22 permanently to the tube 23 and 28. The spring snap in s Inside the tube 28 and fixedly secured thereto there is a plate 43 which has a hole for the operating stud 32 and it has a hole atthe side to receive the lock operating rod'44. The lock operating rod has two arms 45-46 adjacent the plate 43, the latch operating arms 46 and the locking arm 47 The operating bar 44.-is assembled in an opening in the side of the plug 48, and when so assembled the plug 48 and tube 49 are connected together by a punch mark at 50.

The tube 49 has an outwardly extendingflange at 51 to hold against the tube carrying the knob 24 and it is slotted at 52 to permit the handle 53 to be moved from one to another. This tube also has a lip punched therein at 54 to carry the short spring 55, said spring bearing upon a lug 56 carried by the handle 53 which lug holds said handle in conjunction with the spring 55, in either the raised or the lowered position depending upon whether the door is to be left in a locked condition 'or in a condition for its latch to be operated by the operation of the knob.

It will be seen that the plug 48 (note Figure 1) passes slightly beyond the lugs 39 and 40 so that once the screw 56 is inserted in place it is impossible to remove the lugs from their proper position without shearing them off.

The operation of the lock is as follows: Assuming the lock to be in the position shown in'Figures 1 and 2 it will be possible to open the door b pressing toward the door on the knob 25. This will slide the tubes and knob toward the door slightly, and as the arm 46 is in engagement with the bell crank arm 16 the latch 2 will be pulled back and the door opened. If the door is to be left in a locked condition the handle 53 will be raised until the spring 55 causes it to snap to the opposite position, that is, bearing upon the top of the slot 52. This will turn the locking arm 47 downwardly about 30 degrees or more, at the same time the arm 46 will be turned out of the path of the arm 16 and the two arms 45,

39 and 40 snap into slots in the tube 22..

46 will of course, be carried downwardly the -same amount. The result will be that the of the key. If the key is inserted in the lock the arm 33 can be turned to restore the arm 46 to such a positionas to cause'it to engage the arm 16 of the operating bell crank and the door can be opened from the outside or it is obvious that the door can be locked by the key, (see Figures 6 and 7). The lever 33 can be operated by the key to throw the arms 45 and 46 in the position shown in Figure 6, or back to the position shown in Fi ure 7.

he space for the operation of the latch in the casing is so small that it is necessary to notch the end of the shank 3 as indicated at 3, Figure 5, to provide the necessary movement by allowing the latch to pass over the rod 44.

Having thus described my invention what I desire to secure by Letters Patent of the United States is as follows, but modifications may be made in carrying out the invention as shown in the drawings and in the above particularly described form thereof, within the purview of the annexed claims.

I claim:

1. A door lock of the class described comprising a slidable latch, a casing in the door extending transverse to the latch, a bell crank carried thereby, a slidable knob shank, an arm within the knob shank to operate the bell crank, a lever connected to one knob to disengage said arm from the bell crank, and means'whereby the arm ma be restored to its operating position or moved to a osition out of engagement with the bell era of a key a plied to the other knob.

2. A. look of the class described comprising a slidable bolt, a casing within the door extending at right angles to the line of movement of the bolt, a bell crank carried thereby, and a slidable knob shank having a knot at each end, an arm within the knob shank, a snap lever within the knob to shift said arm from a position to engage the bell crank to a position out of engagement with the bell crank or vice versa at will, and key operated means carried by the other knob for similarly shifting the bell crank operating arm.

3. A door lock of the class described comprising a slidable bolt, a casing in the door extending at right angles to the line of movement of the bolt, a bell crank carried thereby by means for operating the bolt, a slidable knob shan lid titt

therewith, and key operated means in the other knob to similarly operate said arm.

4. A lmob shank for door locks comprising a tubular member having a knob at one end, snap locks formed on the end of the tube, a second tubular member adapted to slide over the first tubular member and be locked by said snap locks thereto, and a plug adapted to be inserted through the knob into the inner tube to prevent said snap looks from being dis engaged from the outer tube, and means to hold said block in place.

5.. A door lock of the class described comprising a slidable bolt, a casing adapted to be placed Within the door extending at right angles to the line of movement of the bolt, a bell crank carried thereby for operating the belt, a knob shank extendin through said casing having knobs at eac end thereof, means in the knob shank to operate the bell crank, and means in each knob to place the operating mechanism in an operating position or in a non-operating position at wi 1.

In testimony whereof I have hereunto set my hand this 27th day of July, A. D. 1927.

FRANCIS GEORGE DARLINGTON. 

